Infraction is not deleted when deleting a warning

[Sheldan]

General Troubleshooting

• I have checked for similar issues on the Issue-tracker.
• I have updated to the latest version
• I have checked the branches or the maintainers' PRs for upcoming bug fixes.

Description

When deleting a warning via deleteWarning, the infraction is not deleted, while it should be.

Steps to reproduce

Create a warning, this also creates an infraction
Delete the warning with deleteWarning

Expected behaviour

The infraction should also be deleted

Actual behaviour

The infraction remains